Telephonic apparatus.



Y 1s- 1a *Ipart of' thencomplete disconnect-signal lBe it known hat- 1,1 JoHNj G. Ronnnrsjai i -citize'n ofthe United States,residing'at-Detroit, county of Wayne, f State 'ofl Michi an, 5 hayein'v'ented :a certain `new and useful m-'f provementrin Telephonie Apparatus; and 'declare' thefollowin to bez'a full,clear, and' exact descriptiono .the invention,suchas'A will enableotherseskilledin the 7art Sto which l.1c it pertains to inake'and usethe same, refer# l vence beinY -hadjtov the accompanyingdraW-- in s,ffWl 1i1for m -afpartofthis specication.' y invention relai-,esto telephone-`circuits, and has for vits'object"the construction of a ilelephonicrapparatus hich shall accomplish thejfollow'inglobject Eirst,to eecttheau-v .tomaticswitching o as'gnaIng-CmTentiOn the line of 'acalledsub tion ofthe callingplug'into the called-sub? zo scribers'jjack; secondlgto have 'this si maling,-

'l i current switched automatically en -the called line at specified intervals g Of time, not' conl tinuo'usiy, ,and for Specified number-OiA times andznoxnore, .proyidedgtheparty does notians weri'; sthird, to providefor automatically signaling back to.l the call-ing party,' vindicating -"fthat the calledjpart'X-gdoes not' answer bya doit-answer?. 'signalhwhichshall be sigheledbeekeftel? Certain vfixed time from thebeginning of the call; fourth, to'providea visiblesi al in the. apparatus indicating that' thecalle part did not (answer or that, hav# l ing answered,` e wasthrough with thereon- "j 'nection vand hadhun-g up' his`receiveig-and` alsoaproviding, 'that inp either case vthe. signal fort ejother partfthesaid disconnect-sig; nal being'now under the controlof the call' -l ing-party; 'ifthfto provide means' for uito-` matrcally discontinuing the-.action \of the ringingapparatus 'when the called party an swers thecallgand to then lock the circuit; sol that when heisthroughand hangsu f' reiceiverthelcallin'g a paratus tibeg'in'to eperetefiegein,.whlel lockingftl circuiti Bis aframe coezitensiy Withthe length of` appropriate intervals lcross-bars, ofiwhiclrone onlyis shorvnatB. V Through this .crossf-banBisfa central perfoscriber -by the inserf l the .resiliency of i the spring.

theretetingfermetureheeel; on its hub an inwardlyeproject1nggc1rcu1nferv collecting-ringsfl)5 5129,.- i

engines; ,as h

ch-s n;

at elyA journaled and di motion.l l: Mounted oni ries of thesemachines one forleachoperaringemqunengsforeearme ture..Fig. 'Zilustratesithe-clreuitin annuif-tiple board 'employing my inyention, and Fig. 8 illustrates yitfasl'appl ied- 1 ;o'a trunkinge IbQard-gi l In the'draWinggAisgalshaft commento ai* series v'of -machines, 4 Whi i 'tors set.v One only-isgyshown-anddescribed.

the v'sh'aft, having Lat' the' opening throng' .iwnehihe:Shafepasseeis hi'ch'carriesjiixed e' raised ledgeb2,- end thereto a coiled spring Ithe the spring being attached tot tedftQ rotatel'and 'Windffup magnet to return "to, its.y

circumferential ledge Vis `-undercut atjbs, and

coilY B4, the. terminals edf-by the eleeftlieL end ot' each being attached to thehub A and the othenendtothe armature, as shown in.

Figs. and 6.' The armature is a disk of soft liron,and when the circular electromagnet is energized, 'as hereinafter stated, it draws the rotating armature up to its face and v1s compelled by the contact to rotate in unison with it so long as the contact is maintained. This rotation also increases the tension of -the spring B2, which when the armature Clis re leased by cutting off the magnetizing-current l reverses therotation and restores the electro-y magnet to its original position.

At appropriate intervals near the periphery of the circular electromagnet B3 are transverse perforations bf b, in which are inserted pins b7". In Fi 3 I have shown the details of one ofthese p ungers. In the .periphery of the circular electromagnet B3 are a corresponding number of radial perforations b17, in

which are inserted a corresponding number of'plungers b7. The plungers b16 b16 extend a short distance beyond the 'face ofthe electromagnet B3, as shown in Fig. 3, and opposite the plungerb7 there is a mortise or rectangular perforation, as shown at bs, also opposite the plunger b7 there is a triangular notch b9.

A The plunger b7 has a tenen b, whichloo'sely ts in the mortise bs, so that the two plungers are interlocked'together. The plunger b7 has adjacent to the tenen its enlarged portion cut periphery of the electromagnet and engages the top of the plunger b7. This throws the spring outwardly for the purpose of making an electrical contact for the purpose hereinafter described." When the forcing-plunger blu is withdrawn, the spring forces the plunger b7 downward into the notch on bi and forces b back to its normal position'with its end projecting beyond the face of the electromagnet. As already stated, there are a number of these plungers near the periphery of the eleetromagnet B, as shown in ["g. l, and

`they are. arranged in any manner to carry out 'a predetermined result, as shown. I have arranged themv one in one place, a pair in anot-henplaee, and a set of three in another place, with corresponding mechanisms of spring-contactsforeach, all as'sho'wn in Fig. l.

Fixed to the elertronmgnet is se insulated -blockA B5. and attaehed lo the treme is un abutment B. A in the form of a spring hook, and l,therefore it This is drown in the drawings ing shown in, Fig. Z2.

may be termed a springstop. It is obvious, however, that as it performs the ollice merely of an abutment any convenient form might be adopted. When the parts are normallyin place, the rotating electromagnet is normally held by the insulating-stop B5 coming in contact with this abutment by virtue of e'coiled spring B7. When the circular armature C is drawn toward the face of the electromagnet by its being energized, as hereinbefore stated, it forces in all of the projecting plungers ble b1, and thereforeforces out the corresponding radial plungers b7 b7 and also the spring@ c" c?, connected with the radial plungers, and when the energy is withdrawn from the Velectroniagnet the circular springs controlling the armature throw the armature away, and thus restore all of these parts referred to their normal position. The contact made by the armature with the plugs to the face of the electromagnet is Sulliciently strong, so thatthe electromagnet is compelled'to revolve in unison with the armature in the direction ofthe arrow, thus contrary to the. tension of the spiral spring B2, and on the withdrawal of that energy and the consequent withdrawal of the armature C -the electromagnet is released and is re- ,turned to its normal position by the resiliency of. the coiledspring B2 with the insulated stop B5 against the abutment B.

Mounted upon the frame is a compound switch D, which consists of various arts, and

l fixed sustaining portion or fiame l is fixed to the frame B, and a spring-anvil contact d, which is adapted to come in contact with the springs c4L c4 when they are thrown out by the action upon the plugs b7. InFig. 1 the anvil d is shown in contact with Aone of these springs. The anvil-frame at d vis beveled, and the beveled set-screw d`-, passing through the frame, is brought in contact with'it in such manner that the turning of a setserew will adjust the position of the anvil d toward orfrom the circular electromagnet B, The spring upon which the anvil d is mounted tends to force the anvil toward the electro- IIO magnet, this'action being prevented or stopped by the set-screw d2. i Mounted upon the anvil-arm are two insulated blocks rl ([4, one of which isshown in Fig. 1 and both be- Eaeh of these blocks carries upon its upper end a spring-contact (l5 d", which is mounted in an insulated block D7. Mounted. also in the insulatingddoek D2 is a pair of springs below di d, which are marked J7 (la. This pair of springs is not in Contact. Each of them is perforated to nllow the insulatingddoeksrl (I4 to pass through them, respectively. Upon the extremities ol' the springs (Z5 rl d7 d* are eontaetmints, so that when the parts are in a norma position, as shown in Fig. 1, the springs flf ([7 are in electrical conta-et, as are also the. springsd" rl". Located above the springs di df 1s a pair of spied somme' .in

surfaces of thes crm a; Contact with da land d@ existing betweendi` fw, d, andar-sud maken electrical ce1-inet f mehansm combined .with a multiple and a tfunkin to effect byiethe Contact with terminal 08.* i pose hereinafter specied. f y The shaft yA5,rotating in the` lirectionof .the triad voifsprii 1"gs, `for the. reason 'that they] arelthrown out, as alread "stated, rby the 'attraction of the armature f thecircularelectromagnet yAttached toi the'framezB, in proxilnity` to'f the rvrotating :'03 '03,1`are inthe formgof straps i extremitiesatn-"c-(shownin dotted linesv l Fig. 1) arein'contac't'with the'twojcollectinglated electric l rings respectively connected tothe eXtreInities o if .the coilv incloeed 1n the depression in the electromagnet.. TWO; others,I c6207, vter-v minate v in proximitygto'the 'periphery of the electromagn'etB3,4 but Without -a norma-l con-y tact. Other arms cfc) 'terminate 'inproXiimjity to the electromagnehlbutare notnop v thereby o l'itviiardlyv and makes contact elecinag'net brings this insulatedblockB? against the terminal c and "forces it'into1electrical This is'fora purthe'ar'row, (see Fig .1`,) "istimedt-rotate so thatfthe block B5 is brought from; its fj normal -positionto the position shown in dottedlinesf lnliig. 1 in about*eighty-foursecondsf, Of

course-this may b evariedV to' anyIassignabley degree thatrnaybe desired.) f v y vIn'liigs'. 7 and 8 I have shown this'ringingy The end-s offeachiof are 'y i oints underneath therelay. 6, 'y ffcontactfQ .being normallyclfsed on line whence it y.branches 'on line 1,1, jtransinitter:v Tr to vthearmoii the receiv'ier- *hook, thence through 'Eline 1 1" toqnormally closedcontact`12, and thence: to .the ground;

Thusy therotationet B3, caused lasl hereinbe- X 'jintermittentlyA .makeA and 1 break contacts vthrough the switch vD ,in the" fT1mannenspeciiiedyfonce for the iirstspring,- twice forgthejpair ofspringgy three Atimes forV The 1 o toward theface ofl contact-.15 on armature 1li-,passing through va lamp v16,v thenceto' 'the grfoundf-lii1e,l thus eny v'er na tot `Line10 lisconnecte sleeve Tof tleplug' to line 2 1, -both-in :the oper-` Thesev answer the purpose Vof l'talking-'lines when the connection is" complete.- Line 19'though the collar of the jack I f 18'is connectedwith thecollarof.the lug 22 "and line`23- of the operators-set, so th) plugs-' are three-point g Vs'ystemg: Withcircuitsfso arran cdas,- or'nbinationgfthefresutsal. I ready spjecied',:fthe .and-circuits Withitheaccompanying apparatus! being shown-dia# grammatical'ly; the'l apparatus, {Otherthanf ther-inging mechansmfbeing lthat.whichis]- to,kr "the `ballfvx-i stati jxposite polef'of the batteryfalso 'goes throng K4the clrcuit'.. The currentl through this cirline'lS vto ground, 'This 'completes f A cuit energiies'fthere1ay`6jcloses armature 14, f'

.closes `Contact 15, gland thus shunts .the four? Y and lightinlarn 16,'whichis a 'sig- 'e'operator't at o'.f11 has 1n adejacall.

flhe operator then inserts 'an-answering'- lug .rent-from the bafteryvfrom line l5,: through fpc'iits, onefor t ev tip', one for .the collar orv I lar .of vthe plug j' v' lhetip rv:and the collary orr` ..s'leeve'are connected. with linesv 1- 1 ianlflO, revspectiVely, orthe'circuitconnecting the sub'- scrber. yTl'ie'colla'r 18. is connected by line '19 to relay 8 andthence to the' line connect-' IOO nected tbroughthe tiofthe lug to linQZO. Y

dliith'roug the .collarxor-:f

ing Vthelam-pand ground. Line V11 isconl Withthe three-pointjac tracin line at the pilsugscorresponding 23 .itWillfbe found-to pass through the vamp 24, thence throughsJ resistance'25 t thebat- 1 v connects wi'ththe vcollar fof thejack, thence Y tery-linjef 3, 'th'roughthe batterytojground. -overline Commencingat the plugf it over linelQ, through rela l8, 'to ground. f A zv energized; over'v the metallic line vand fthe' ganilo the plug, contacting 43 with the sleeve of a plug 'and contact 44 with the collar of the Jack and collar ot the plug. The connections 42 and 43 are the line connections.- Then these connections are made, a circuit is established lfrom the battery F, through resistance 45 line 46,' to the three-point switch 47, which is normally in condition shown -in the drawings, making contact 48, line 49, to

normally closed contact 50, thence through -line 51 to the magnet-coil B4 of the ringing mechanism, thence over line 52, thence over line 53 to the 'collar of the calling-plug, which ma make contact 44 with the collar of the jac continuing the circuit over line 54,

through relay 55, through line 56 to ground,

vthe opposite Vpole of the battery being also tuie to its face, and by virtue of the continuously-rotating s haft A itcommences to rotate, and being in the position shown in Fie. 1 it makes the contacts specified and, as will Vbe hereinafter described, actuates a circuit which rings the called-subscribers-bell irst once, thenltwice, then three times, if lie does not answer before the completion or'A the i ringing. Should the party not answer, the

i ter G, line 62, to ground.

eleetromag'r'iet continues to revolve until the ,block B-closes, as hereinbefore described,

contact 30, which actuates a dont-answer sign al and brings up against the switch abutment c", closing contact 31 between the two `springs and actuates a circuit which breaks the circuit in which the electromagnet is ineluded, and thereu on the rotary electro.- magnet B3 is compel ed to return to its original position by the tension of thespring B2. The dont-answer signal is located in a circuit energized by the battery G and may be traced as follows: Commencing at Contact 30 it passes over line 57, line 58, and lines 59 and 13 to ground. Upon the opposite side of the Contact it passes overline 60, through the dont answer intcriupter 61, to bat- By means of the in uction-coil windings ll H the buzz ot the interrupter is heard by the calling subscriber, whereupon hehangs up his telephone;

As alreadystated, the insulated block B5 'coming in contact with c closes contact 31, and this establishes a circuit as follows; Over contact 31over line 32 to line 52, to line 53,

to the collar of the calling-plug, thence to the collar of jack 41, thence over line 54 to relaycoil 55, thence over liuc 56 to ground. Be` ginning again at contactV 31, passing over' line 63 to first coil of relay 64, thence to threepoi-nt switch 47, over line 46, through resistlance 45, over line 3, to battery, tien over line 1,3 oi'i the opposite side of the battery l? to ground. This energizes the locking-reign erased 64, opens contact 50, and closes .contact 65; This interrupts the circuit o ver hne 51, connected with the energized coil of the rotating electroniagnet B3, releasing its armature C from contact with it b the` action of the spring C', whereupon t e rotating electromagnet is restored by its reverse motion to its original position, the restoration being effeet-ed, as hereinbefore stated, by the coiled spring B2. The closing of contact 65 allows current to flow from battery F over line 3, resistance 45, line 46, line 49, to contact 65, thence through locking-coil 66, thence over line 67, through the supervisory lamp 68, then lin'e 53, to collar of the calling-plug, thence over line 54, coil 55, and line 56 to ground. The opposite side of the battery is connected to ground by line 13. 'lhis is a substitute circuit for the one just established by the closing of contact 31, and as the reverse rotation of the rotating electromagnet opens contact 31, and would thereb r restore frontact50`, the circuit just describe( is introduced as a substitute therefor to energize the relay 64 and maintain contact 65, which keeps co11tact450 open and at the same time lights lamp 68, indicating to the operator that the called-for subscriber did not answer, or, as' will hereinafter be seen, that the calling subscriber had finished and he had hung up his receiver. Under either circumstance the operator would withdraw the callingplug Jiom'the jack 41. It, on the other hand, as the rotating electromagnct actuates the calling-signal for the called subscriber, if he answeis by taking down his receiver he IOO closes contacts 69 and 7 O with and through 73, line 74, contact 75, line 76, to supervisory relay 77, line 78, repeating-coil winding ll', line 3, to battery, on the opposite side commencing with contact 69, line 91, to contact 42, with the tip of the plug, then line 79, contact 80, line 81, line 58, through repeatingcoil winding ll, to line 59, to the opposite side of the battery. This circuit operates relay 77 and its armature 8'.) to close contact. 83, whereupon a further circuit is established very similar to that established by the clos'- ingof contact 31 instead of going over line 63. From the locking-coil 64 it pases over the ar" mature 82, through Contact 83, closing over line 53, to theeollar of the calli1ig-plug,thencc to the collar of the jack, thence over line 54, to relay 55, and over line 56 to ground. 'lhe other side of the circuit is made over line 13 to ground. Ehe action of this circuit 0there- ISO.

' l vContact 83,1.shunts out tile lamp 68,' so that it closed Contact vv 31 It vv vll. be noticed lthat this latter circuit-pessin' I glyes in Q' f indicgttioni lighting, vas elr'eaily "l L statedinfalforlner instance.'

:After th termination -Of thefcnvfstii v'between lthe vtwo krsubserib ers they proceed to f hang up 'theirreceivers' upon-the receiverhooks,,'.thereby. .breekingcontaets'1 and '2in the'calling,subscriber?slset. This 'interru ts a' .cireuit'about'the supervisoryfsjgnal 24; WhiehA` ground. Aperellel eircliit is'establifsliedjdrlrin'g conver'saltion overfline 3,then over the Windr4 ing repeating-coil H- through relay 84, closingv contt' 86`,`thence `tofline 21 to the sleevelof-L the jack, thence to 'contct '87, thence' over line 10 'tocontstct2].,` over line -111 'to tipgof the I thereby'clecornes?er?eleitringout signal4 by its `being, relightedfwhen the lreceiver-visl yhung on 'F.heblfeiking'ofy contee'tsfl. and;v 2 destroys the .powerpfthe relay`84f When/ the 'celled lsub'se ber. hangs 11phis 4re'- ing-outjsign'alforthe cfilledsubsoriben r The three-pointfsyyitclr47inaybe used for '(lctainnrfgf the" :rc ron' of the 'ringmglelectro-f overline 53, through- -fIhe manner'offrroducingthe inrcedcurrent `1s `'old and wel form no part Of'this in ve opens oontlct 86.

andA byold andxwell-known means rmg such fone'o'f these subscribersas may bedesired.'V vAll ldesiretoillustrirte-is theconneetion'of thisfbank of ringing-keys ywith they system as .showingthe' 'manner-offintrodueing the ringngoperatorcould; vthus *insert the lplug ingthejand "during: 'the timethis' lure Wasilbusy. the Y eircuitjjust. deseribedgthrough thelempy ,685 would be shlnted Ab'y`the closingfofr Contact 583, es; before'. 'descrbedyend' ywhereupon' when the subscriberhungn his receiver-and was throi 1gh talkng the;.s unt maintelned by the contact/83 Would .be open, -thesignal uffi ingparty from overhearin'gtheu'covnvers'a-` ftion'. Byc'losing contact 4 8. the operator vcan start Ither rngngrnechine es' it` restores I "the-'oircuitsj as alreadydesribed. ,It i.S.' une necessary ode'scribe-'thegircnitsof the Opf;-` altat'ors se- ,asthy are CommOflfandinevery. ydey use 'end form no part-lof-Lths invention.' y f opposite' sidelof the bfittteryv o verlin'el to f The interrupted curr lective ringe; ,ing-keys,y theeonst-ructlo andjjoperatwn of,y f

t v keys -m 'which 'any onegdepres former releases, 'The depression of'anykey Aline ;-but bythe arrangement x 1 5- knownfitis obviousy to those s`liilledj-finv the rtf that I may putl four' subscribers en the line subseriber. Other. systems might be ilsed, as

, without departingfroingthis inyene I `called for has'his line terminating inY switchboard she immediately instructs an operator at'the Y switchboard, by means of a special circuit, (not shown and to which she can have connection by a key at her disposal,) the number of the subscriber called for. The K operator located at Y switchboard assigns to the J- operator the number of the trunk which she, theK operator, -desires to use, whereupon the J operator inserts the callingplug 140 into the trunking-jack 98, which is X switchboard terminal of the trunk as-l signed, as. before stated. At the same time the K opcratorprocceds as follows: Picking up the trunkingeplug 99, which is the opposite terminal of the scected trunki1'i0i'-linc,she

tests thclinc of the `called suoscriberby touching the tip1()1 of the plug to the sleeve 102of tlicJack and assuming she finds itnotbusy will insert t-he plug into thcjack. Both operations in making a trunkiiig connection are thesaine as have been followed in previous tiru'nking systems :uidweltknown to the art. .At, this point, however, l provide means for starting and stopping the ri nging-inachino automatically, and itisnecessary that both connections just describcd--nainely, the insertion of the ca lling-plug into the trunking-j ack and the insertion of the tru'nking-plug into the jack of the called subscribere-bemade to start thc operation ot' thc ringing-machine. Fronr this point -the ringing-current is applied through the trunk and through the connection at the Y lswitchboard to the called-subscribers line incxactly the samev manner as had been described when the connection 1s entirely upon the ont switchboard by the insertion of a callingplug in the multiple jack. The ina- ,chine stops automatically at the endfof this motion or u on the called subscriber taking his receiver rom the hook as before, and the disconnect-signalat the X switchboard operates in the same manner as under the previous circumstances. We. will say, for instance, that the called subscriber had hun up his receiver and a disconnect-signal ha been indicated to the J operator at Vthe X switchboard. The J operator will then withdraw the callingplu i from the trunkingjack, the withdrawal o which automatically signals Vthe K operator at the Y switchboard 65 by the lighting of a signal associated with of the circuit is over line 130 to ground'.

that trunkn ,-wiieeu' on sh, the -K yoperator at the"`switcli card, withdraws the trunlfing-plug from the called-subscribers line-jack, and the'disconnect is complete. This operation is carried out by the following circuits: It will be noticed that the circuit from the sleeve ofthe trunking-jack through the coil 1,03 to contact 131 to earthl'is normally open at the contact 131. I Ience when the J operator inserts the calling-plug into the trunking-jack th'e circuit as previously described through the coil of Athe rotating electroma net is not completed, but will be open at this contact 131. A circuit, however,I is made from'the battery 'IF to line 3, coil H', line 78 to the coil 77, line 76, contact 75, and sleevel 73 of the calling-plug to contact' 105,v line 106, line 107,l coil 1.08,' line 109, coil 110, liner111, contact 112, tip 141of the calling-plu line 79,- contact-S0, line 81, line 58, coil I?, li'ne 59 toba'ttery F. The relay-coil 108 is of a very high resistance, in practice about twelve thousand ohms, to prevent t-he operation of supervisory signal 77 at this time from the battery F. The current flowing throu h thiscoil closes contact 113, which establi's es 'a shunt around'lain 115 by the line 114- and` the resistance-coil 116. It is asumcd that thc operatoieiias or will at this moment insert the trunk-plug 99 into the jack 100, whereby circuits are established as follows: from the battery F through line 1 17, coil 1 18, contact 119, line 120 to lamp 115, a shunt about the lamp through the line 114`and resistance 116 havingbeen already completed, thence continuing through line 121 to thc collar 122 of the plug, thence to sleeve 102, line 123, coil 124 of the eut -o1i` relay, thence over line 125 to ground. This, does not light the lamp, owing to the shunt through contact 113 around it but it is 'in position to be lighted as soon as contact 113 is broken, and it thus serves, as hereinafter shown, as a disconnect-signal by the. breakinfi of the circuit through coil 108. 'l"he cstablishing of a circuit through coil 1 1S actuates its armature and closes contact 120. This establishes another circuit from battery F over lin 127, rela)r 128, line 129, contactl 126, line 109 to coil 110, line 111 to contact 112 of jack, thence to tip 141 of the plug, thence to contact 30, over line 81, line 5.5 to coil H, line 13 to ground. The opposite l( current now passing throughV coil of the relai' 110 is suihcient'to operate it, whereupon il .closes contacts 131 and 132, contact 131 cstablishes a ground connection at G through ,thesleeve 133 of the trunking-jack 9S, and the closing of contact 132 puts a shunt around the coil 110 of the relay. The relay, hew-y ever, remains closed, because of the current passing from the battery F, through contact 131, through the circuit already traced tocontact 131 to ground. The circuit through IOO y' is.

'45 j draws the plug :arms 5134. and lamp 115 'and' and over thecircuit breaking- .ofvcontact 119.

the relay 118'closes contact112'6, and as!y soon mature. v134:1:y an

tact 'between' the. armaturef Alilija'nd lthe cuit tror'nthe-coil' 128,'.thro'u'ght ese two 125fa'nd ground. The`lan1p, however,'is not actuated, as it stillrelnains shunted by contact 113,' as ialreadystated'; TheI circuit heretofore mentioned as;

- as contact 1.19.is` brokencurrent' ceasing-to fiowfthrough AI elay 1 18- breaks'` .contact 41 26j:

l :leads-.to the operators' manner for obtaining the busy test, .and" con.l tact 138 is established-, Whichclos'es .the talk#y the' boards l'over .line "109,

nection with Fig.' 1,

rent off from relay 108, ftheruponfbreaking' contact" 113`and 5othrough it, as already state operator 'u pOI- `the AY trunking-V A55l 1 einen.

`the ringing mechanism is '35' completed,throudhthesame circuits and thev contacts.heretofore'describedinhis'tele Y butrlay 128 remains operative by virtue of? the switching of a current vthrougharmsP1134: andy 1135,'.as' already stated.y kThe operation of: relay 128 also-breaks lcontact 137, vWhich saine vcircuits Onl hanging up hisV receiver and breakinthe is- .broken,' as herein-before described incon-f o Where-upon the disconi-` neet-lamp 68 islightedthus operating as: a' clearing-out signal,

erator' at the Xboard With--l o m.' the trunking-line j ack,

as hereinb'eiiorev stated,r

whereupon the o breaking the contacts therewith, takingcuri shunting around lampl 15,

which then becomes lighted lby virtue offthe (passing. directly ,whereupon the board withdraws the j plug from. thekcalled subscribersy restoring allof'thefparts of all off' -the circuits to their'n'ormal position and con- T The relay-'coil 108is bridged, through'- theinedium "off linesv 107109, c lirectly across d the talkingfliiie'butfis of suflicient in iped'ance 6o d l :Fromthe centerofeoil 108runs'the connect ingeline 142' directlyto' pose y`ol" thisp is to. keep to prevent'shortcircuiting the voice-currents;

the'y cirjeith'e'ron oneA side -1351and werjlinev 120fto the-` from 'thence through 'line' 121 already described .to line passing' through re#- is broken by thel `The actuation of;

. used herein I me preferred isthat described',' 'Wher'eby'it .telephone in mensual.- fouowedby a perid- 'through the trunkingflineL one;

'netfor 'the in contacty tf iasv escribed;

f 2..A In .con'rbinationwith yfratu's 'of aVv telephoneesubst'ation, a ringing de-'21 central "station, consisting" .of acontinuouslyrevolving.shaft, an arm`a` vture"revolving'therewith .capable of movel 1 inthe line -oi the shaft,

are v'such that a Gwentcomplete-'circuit through either. one halor .the other of the coil-'108i to the groundatthe o ne sidel or the otherof the selective ringing-" vkeyl kee in closed. t ory. effect,

its arinature^`and contact v113 erwise \ve""vvou'id havev a 'vibra-. due to the alternations of the alternating current of the signal.' I

The .different .circuits` estab-1 ished. by Vdepressing'. selective 'ri,- r igingkeys ground f connection is rnade' or. the other oftheline' dur- .ing-the moment of the passage of thercallingf'- Hencethe batteryFtivill have .a

' l. -Bfyv interinittent perio'diof ringing device n Such agringing. device that comparatively long intervals 'or 'rest' or of no current o'ccur'throughout: thesending ofthe signaling f or ringing current,` which is-fothe'r; Wise of the'fperiodic regular 'short intervals g The arranv'ein'ent tegen-i ellis first Vgn'fe'n one' .ring

of rest, then two rings1-fo11oWedby1a-- second ;v rest,'tlier'i-three` rings', and other' arrangements" could beffeinployed., .It" )vill also be seen; that theringing-current"al "Ways starts.immediatelyupon theinsertiony l which diiiers from@ the ordinary'scheineo employing'a'dividedring-contact upon a revolving shaft, which of; vthej connectingplug,

may or :may

' 1'. In combinationI with l' ratus of a telephone-substation, ayringing` delr vice located at` the centr-al station;.consisting l of acontinuouslyervolviingl'shaftjan"arlnalf' I l turerevolvind therevvitl'i'capable of movement longitudinally-in the line of fthe'sjhaft, 'a-

c rcular electrornagnetif cncentrically ern-V- conta'ctsgaremade tofactuate Athe ringing mechanism at; the substation, an electromagf.

- netic means for autom aticalliy.discontinuing-V the circuit" energizing". theV electromagnet :whereby the armature is' released therefrom" jthe'electromagnet returns; automatically ieg bracingthegshaft, but elastically attached to :a iired portion of thesust'ainingfframe, elec# .trical means "for energizing: said electro1nag-2 1 urpose of bringing the armature 'rio erewith,:whereby` said 'a armaturer`` f cornpelsa partial rotation ofthe electroinag-'- i 'netjrnieans-attached to the.V periphery of; the 'electromagnet Awhereby "a seriesV of ringing' TI l' -to its original position by virtue of the rsili: s ency ofv its 'elastic connections, substantially vice located at 'theV ment longitudinally ivesignals'over this 'trunliing-line' to acalled a circular electromagnet concentrically ein the-'ringing appa` fr t. 12.5

bracing the shaft, elastic connections between the elcetromagnet and a fixedl portion of the sustaining-frame, electrical means for energizing said lelectromagnet for the purpose yof ringin the armature in contact therewith,"where y said armature compels a partial rotation of `the electromagnet, means attached to the periphery of the electromagnet whereby a series of ringing contacts are made to actuate the ringing mechanism at the substation, an electromeans for automatically discontinuing the circuitenergizing the electroinagnet whereby the armature is re- Aleased therefrom. and the electromag net returns automatically to its original position byvirtueof the resiliencyT of its elastic connections, and means ywhereby said electromagnet is energized by the closing of a circuit' when thefcalling-plug is inserted in thc calling-jack, substantially as described. I

, 3. In combination with the ringing apparatus of atelephone-substation, a ringing device liavinga sustaining-frame located at the.

vcentral station, consisting of a continuouslyrevolving shaft, an armaturerevolving therewith capable of movement longitudinally in the line of the shaft, a circular velectromagnet .concentrically embracing the shaft, elastic -connections between the'electromagnet and a fixed portion of the sustaining-frame, electrical means for energizing said lectromagnet for the purpose -of bringing the armature in contact therewith, whereby said armature compels a partial rotation of the electromagnet, means attached to the periphery of. the electromagnet for making a series of ringing contacts toactuate the ringing mechanism at the substation, an electromeans for automatically discontinuing` theI circuit energizing the electromagnet `whereby the armature is rcleased tlierefroni and the clectroinagnet returns automatically to its original position by virtue of thc resiliency of its elastic connec- A tions, and'means for energizing said electromagnet when the calling-plug is inserted in the calling-jack, anda "dont-answer signal'whereby, after a specified interval, the calling subscriber is notied that the called subscriber has not answered, substantially as described. l 4 A. In an electrosignalinor apparatus for a central station of a telep o'ne system, the combination of a continuously-revolving shaft, a series of electromagiiets one for each operators set arranged concentricallyupon said shaft, a framework with sustainingbrackets each having appropriate bearings for said electroinagncis, a spring connection between each of said magnets and each of s 'id brackets, means for holding said electroinagiiets iii a normal or reposing position against the tension of the spring, a series of Vrotating armatures corresponding to said eleciroinagnets, each of which is in close proximity to each oi said magnets, said armatures being concentrically attached to said shaft and rotating therewith, but capable of longitudinal movement thereon, elastic means to resist such movement, a source of electricity, means for completing a circuit from said source through'the coils of each of said electromagnets respectively, by the completion of a conversational circuit, whereby the said electromagnet is caused to revolve due to the contact of said ai mature, ringing mechanism and` circuits actuated by said revolvin electromagiiet, and means for automatica ly rcstoring each of said electromagncts respectively to their original position, substantially y as described.

5. In combination with a continuously-revolving shaft, a fixed framework, an electromagnet a coil-spring to rotatably attach said magnet to said fixed framework, means for retaining the magnet in a normal position, electrical circuits adapted to energize the coil of saidelectromagnet and a disk armature connected to rotate with said shaft, spring* mechanism thereon for normally holding it away from the electromagiiet, and adapted to he ovei .om(` by the attraction of the magnet for the armature, whereby the armature would compel the electromagnet to rotate so long as the two were in contact, a stop fixed to said rotating magnet to limit its rotation and a series of contacts actuated by said stop, whereby the circuit hy which said electroinagnet is locked to the armature is broken,

` thereby autoi'natically releasing the armature from the clectromagnet, substantially as de scribed. i -v 6. In combination with theringing apparatus of a telephone-station, a ringing device consisting lof a continuousl-y-revolvlng shaft and a stationary frame, an annular relay concentric therewith consisting of two parts one part rotating normally with the shaft and :i spring to normally attach the other part to IOO the stationary framework to permit rotary motion, means for energizing the electromagiii t of said relay wlierebj the. two parts arc magnetically attracted and rotate in unison while said electromagnet is energized, substantially as described. f-

7. In al telephone system, subscriber-s lines,- an operators connective devic'icka ringing-generator, and means to connect said gcn- IlO erator to said device comprising in 'part a rotatable shaft, a circular magnet or r'i'lay comprism(i two parts, one a disk armai're and,

the ot ier a core or shell having a coil wound thereon, one of said parts being mounted to rotate with the shaft, and the other mounted to rotate independently of the shaft, and a coil-spring having one end connected with said latter part.

8. In a ltelephone system, subscribers lines, an? operators cord-circuit, a ringinggenerator, and means to connect said generator to said cord-circuitcomprising in parta `40 12-. I n a'telephone-central-oflice ringing apparatus,arotatable element hayin'gfa'lpi-n] or plunger in its periphery, far longitudinal f plunger coacting with said .peripheralplunfv v4s l -rotatable shaft', a circular 'rnag'ginetV coniprisv ing adisk armature mounted to yrotat'ethere--4 'wi'th, and a circular shell orf coreihaving a magnet-coil woundithereon', ay support on: which said core is vrotatably ni'ounte'd, and a. spring yieldingly" connecting.l saidv c ore `With said si 1pport. i Q Iny a-t'elephone system,k 'subscribers lines, an operato'rs cord circuit ,j a ringingj generator, and means 'to` connect'said generj-V ator to said cordmircuit' comprising in part `.rotatable shaft, an armature anda magnet` i core orshell through Whichs'aid shaft passes,

the said armature beinginounted to rotate' withsaidv (shaft and` `l` eing longitudinally'v movable thereon, and thesaid shell being' suppcrtedfindependent otsaid shaft,v a coil-1l lIO i' spring surroundingthe shaftarid within' the shell and' havingan end' Connected With the shell and another with the supports! i 10.In a telephone central office ringing`-` apparatus, the combination with framework.l

" of .avylindrical rotatable part therein,1con

f tac'ts'n saidvfranie'work near-the said cylin- V'25 tions', projections on saidcylinder to operate, l saidcontact's asv itrotatesinvr one direction,

der, means to effect its rotation in both direcand 'means torgpreventing usuch operation rection.

-when the cylinder. rotates Ain thereverse di- `1 1. In a telephone ycentr-aloffice ringingn apparatus the combinationjfof -a .cylinder mounted torotate OJWardand backward thereim'p'ins, lugs or projections extending froin saidcylindcr, lcontacts mounted on .the frame in the path of vsaid pins, lugsor proj ec- 1 tions, f :tml-means rfor drawing in said pins,1

'- lugs orprojections-in the ybackward-rotation' 'apparatus,` a rotatable/shaft, a cylindrica element adapted .to rotate` independently of of vthe-jgz ylinder so that the contacts arenot then(meratedl a v.

ger to project the saine beyond its normal .pcf

sition, va spring -to force 'said 'plunger vback into'the cylinderfrrieansgto press on said lon-- y gitudinal plunger-t0 project vthe otherfand l contactslocated Withinop'erating distance`of- V50 ,l 'A' i i'f 13. In .a telephonecentral-office ringing.

. apparatus, a rotatableelenienthavingfasef" ries of plungers radially movable in yit`sl 'pe 4 j' riphery,"L longitudinal plungers` adaptedfto. proj ectbeyon'd the' facelof said'- cylinder and` 'coactingwithvtherother pliijn `ers to forcethe same;v outward; springs to old thefflatter plungers inWard,.-contacts.mounted in the v path of "s aid.. projected peripheral 'plungersv and means to simultaneously press uponand' said projected plunger.

release all thelongitudinal.plungersi j 14.* In av telephone central# office ringin tosaid yshaitlnit'l'ongitudinally-Inoyablejcon#l I ',tacts located nearfthe periphery 'of saidfcylinder, 'plungers vradially inoyable in the ,pee ,riphery vofV said cylinder, longitudinal plun "gersl projecting `from the endor facefofsaid.

cylinder and cooperating with the other plun- 'gers' to force them outward, andmeans to i I force said disk against' said cylinderto` rotate i th'e saine'and operate the plungers.

SI5'. In a'ftele'phone central-oice ringing 7 5'.V apparatus', a rotatable shaft, acircular relay or magnet comprising al disk armature rota-, tablysecur'ed to 'said shaft and .lor1g' i tud inally.v

movablel a concentricrnagnetcore or shell i I rotatable independent ofsaid shaft andfhayf' a coil Wound jthereon, afsprin connecting? 1 to force the Asame outward, means tofforce; 8 5 j them inward andthe longitudinal -plungers back',- contactsmounted in the pathofi-the projected peripheralplungers,` and means to.'

the armature,.prcject the plungers androtate close a-circuit through sald'coil to draw up i. i

. l9o the cylinder 'againstthe vtension of the. said spring and vwhen said circuit is broken..v to rellease the armatureand. draw. in the plungers, 'so as not to operate thev contacts-on the back. Ward rotation of the "magnet-cylinder. f

- -95 "w16, 'Inatelephonefexchangathe combination With'linecircuits,'of operator s connectinto'oneof'said circuits by the act of con! necting saidmeans thereto, a timelirnitfap,. l `p'aratus, and a donteanswersignalauto-i -rnatically operated by said time-limit appa# '.ratus after. a predeterrninedtime.v I.17.v Ina'telephoneeexchange, the combina- I tion with luie-circuits, of operator s -connective meansy 'tor4 interconnect said circuitsin L pairs; a'j'periodic callingdevice introduced: into one of said circuits. by fthe act of yconnecting said means thereto, -anautomatlc 'ive-means to interconnect saidlv circuits in f pa1rs,la periodic 'calling device introducedmol time-limit apparatus forcutting ofiY vsaid calle" 'in' device afterf'a predetermined ti eganda r:signalautomatical y 'opery `ated by said time-limit apparatus after a pre- Y j f' IIS I.' '18.' In a telephoneexchangeithe c omblnaa 'l I tion Withlinecircuitazo voperato'rs connect- -iye ymeans'l to interco'iinect said circuits in pairs', anda 'periodic callin deviceintroducedv rInto onef'of saidfcircuits y the act of confv ne'cting said means-` thereto, an automatic tixne-f'liniitap ar'a'tusfm'cuttingosaid.calLy .'ying'deyice a tera predeterminedtima -an'd anperatorsdisconnectingsignl automatic-g.

ally operated' bysaidjtirne i apparatus,

aftera predetermined' time.'l

.Y 192g' Inv a telephone-exchange tion With.lin'e circuits,' of' operators connect- :iye nieans tol interconnect saidcircuits in pairs, a periodic @tiling device introduced' 159 into one of said circuits by the actJ of connecting said meansl thereto, an automatic time-limit a paratus for cutting 0H said calling device a tera predetermined time, and a' ated by said time-limit apparatus after a predetermined time, andan automatic cut-ofi device o erative after a predetermined time to cut od said calling device and said timelimit a paratus.

21, n a telephone-exchange, the combination' with line-circuits, operatorsconnective means to interconnect said circuits in pairs, a periodic calling device introduced into one of said circuits by the act of connecting said I means thereto, an automatic time-linut apparatus for cutting o f said calling device after a predetermined time, a dont-,answer signal automatically operated bysaid timelimit apparatusafter 'a redetermined time, and an automaticcut-o device also operative after a predetermined time to cut ofi' said calling device and said' time-limit apparatus. i"

22. In a telephone-exchange, the combination with line-circuits, operatrs connective means to interconnect said circuits in pairs, a periodic calling device introduced into one of said circuits by the act of connecting. said means thereto, an automatic time-limit apparatus for cuttingr off said calling device after a predetermined time, an operators disconnecting-signal automatically operated by said time-limit apparatus after a predetermined tiine,land an automatic cut-od de- ,'vicev also operative after a predetermined time to cut oii said calling device and saidV time-limit apparatus.

23. 4 In a telephone-exchange, the combination of linecircuits, operators connective means to interconnect said circuits in pairs, a periodic'calling device introduced into one of said circuits by the act of connecting said means thereto, an automatic time-limit apparatus for cutting ofi' said calling device after a predetermined time, a dont-answer and an operators disconnecting signal automatically operated by said time-limit a paratus afterl a .predeterminedv time=,.fa'n an automatic cut ofi` device operative during said predetermined time .to cut ed said calling device and said time-limit apparatus.

24. In a telephone system, the combination with 'a telephone-line, ot a periodic calling device connected with the line in the act of essaid calling device and said time-limit apparatablishing a connection therewith, a timelimit apparatus, a dont-answer signal automatically operated by said time limit apparatus after a predetermined time, and an automatic cut-off device adapted to be op- 7o erated by the response of the ysubscriber to l cut ofi the calling device.

' 25. '.The combination with telephone-lines', of a periodic 'callinOr device connected with one of the lines in he act of establishing a connection therewith, an automatic timelinut ap aratus for cutting ofi said calling device a ter a predetermined time, a dontanswer signal automatically operated byl said time-limitapparatus after a predeter- Vmined time, and an automatic cut-off device adapted to be operated by the response of the called subscriber to cut ofi` said calling device and time-limit apparatus.

26. The coinbinationvwith telephone-lines unitedior conversational purposes, of a peri` odic calling device connected with one of said lines in the act of making the connection, an

automatic time-limit apparatus for cutting oii said calling device after a predetermined time, an operators disconnecting-signal automatically operated by said time-limit aplparatus after a predetermined time, andA an automatic cut-off device operated by the response of the called subscriber to cut'o'l'l tus. y

27. The. combination with subscribers lines, of a periodic calling device introduced into one of said lines in the act of making a ico yconnection therewith, an automatic timeliinit apparatus for cutting off said calling device aiter.y a redetermined time, a dontanswer7 signa and an operators disconnecting.- signal automatically operated by said x05 time-limit apparatus after a redetermined time, and an automatic cut-o device operative by the response of the subscriber to cut oii `said calling device and said time-limit apparatus. f.

28. The combination with a elephoneline, of an operators cord-circuit having a connecting-plug attached thereto, an intermittent periodic ringing device adapted to be connected with the line upon the establishment of a connection and to always send out e ringing-current immediately u on the insertion of the plug, and means to isconnect the said device upon .thel response of the called subscriber.

29'. The combination with a telephoneline, of an operators connecting-plug, an in termittent periodic ringing device adapte to be connected with the line by the act'iij iii-- ITO serting tlic pluff, each intermission in theazg,

'send out ringing-current upon the insertion ofthe plug. anc means operated by the re-` 13o line ci' 'ringing device-` associated the c ordfclrcul't, and .meansjforfjautomamcall ccrdfcennectrg-means'iorautcrnaticallyfcon upon. connectingjsaid cnnector g Witli'- fthe v4o.scribers line; and; 'urt'lierzmeens '.for-follereyl e laftercontrollingthesaidsupervisory,Signals-Q f from )the sub'stations ,l -whereby z ihe; `c perat 1f t the lcord connectorflia's complete `superYisio'nfofthefccnnection@if "34. Theficornbination a ca lng and v vcalledl telephonefline' and aff ecrdcircuit 'at f aj central office 'for uniti-ng them; of an autojz `matic ringing device at `"che :central roi-Hee fer automatic time-limitapparatueset 1n Operag tion; simultaneously withftl'ie .autcmaticj ring- -ng.devi'cej,and inleafns.l controlledlby saidlzirne-t "Y limit. ap arafus .for actuating Isaid switch,t l Where theycalling"partyisautomaticallyi g notified'.avhenv thecalledtabion .hjafbeenf'si I e callingline,'angautomatictime I I lilS Iandfa'ringingf'device associatedwith che` connecting thesame with t `e calling line, an;

fingdevice ignalland -is 'automatically ntifiedwhen the cal ed sta-'P @giventfriei'substen# -f current anda ringinV ldex'ice'raii. the 'central n.1 y y for connecting' the- "sarne'with the calling line- 1 "comroiledbysaidatimehmeadeyiaei-wherby" che called.' party visaudonnaisic'allysignaled `ier.

af definite time', andj; upor'jhie failure 'itc lre?r (eyelid, a'lreport Eto `that` eiectis 'automaticf a ly made Ato vthe calling party, substantially" v'as des cribed.` "if .38. iTheLcomb'nationwithacalling anda"` ing .the 'ringing-current, an automatic time'-v -trqlled' bjy "said timellirnit device, W ereby the A: {calldfpartyis automatically signaled for. a 'definite tirneandmponhie failretc respond; areporbftothateffect isautomatically made y to -'the v-calling f .pariy`," Substanfgially asf de-V scribedy;

r connectingAv engaging wfsignalfthejeauege' ,maris a,

he' saine? tol sweri' signal, and an the first-mentioned or'called line, and an automatic time-limit device for operating said switch and for disconnecting the ringing device, substantially as described.

40. The: combination with a calling and a called telephone-line and mea-ns at a central ol lice lior uniting them, of a source of ringingcurrent and means for automatically applying the same to the called line, means at the l central olIice under the electrical control of a i switch at the called station for disconnecting l the source of ringing-current, a dont-anl swer signal and an automatic switch for apl plying the 'same to the calling line` an automatic interruptor l'or intermittently disconl nectmg the ringii'ig-current from the called line, and an automatic time-limit devicevto disconnect said source et' ringing-current and forcontrolling said automatic switch, whereby the called party is automatically signaled vlor a given time, and a signal then transmittedv to the calling party indicating that there has been no response, substantially as Set l'orth.

41, 'lhe combination with a calling and a called telephone-line and means at a central ollice l'or uniting them, of asource of ringingcurrent and an automatic ringing device for applying the same to the calIed line, means controlled through the agency of a switchat thev called station for disconnecting the source ol ringing-current, a source of current connected with the calling line, means at the substation of the calling line for determining the flow of current therein, and a Lvdont-anautomatic time-limit apparatus for disconnecting said ringing-current l rom the called line and`applying the "dont1-answer signal to the calling line, substantially as described.

42. 'lhc combination with a calling and a called ielc}xhone-line and means at a central ollce for uniting them, of a source of ringingv swer current and means for automatically applying the same to thel called line, means at the central ollce under the electrical .control of a switch :it thc callcd station for stopping the flou' i il' ringing-current, a I don t-answer sig nul` a switch-for applying the same to the calling line and disconnecting the ringingcurrent from the called line, an instrument in the calling line responsive tothe dont-answer signal, a rotatable cam toraetuating the switch last mentioned, a device 'for interl mitt ently int crruptingthe flow of ringing-current in the called line, and an electromagnetic device for controlling the rotation of the aforesaid cam, substantlally as described.

43. ln a telephone system, the comblnathe calling party of the failure of the. called party to respond after said time, substantially as describe 44. In a telephone system, the combination with a calling line and a called line, oi means at a central olice to interconnect predetermined them for conversational purposes, an auto-` matic ringing device for the called line, a time-limit apparatus, and a dont-answer signal, said time-limit pa atus being adapted to cut ofi` said ringingdew -ce after a predetermined time and to con ie `t the dont-ansignal to the calling line to notify the calling party of the failure of the called party to respond. Y 45. The combination with a calling and a called telephone-line 4and a cord-circuit to unite them, of a central battery connected with the cord-circuit and supervisory signals associated with' each end of the sai( circuit, an automatic ringing device connected with the cord-circuit, by the act of'connecting the said circuit with 4the called line, a relay to disconnect said device controlled by current from said battery fiowing in the called line, said current-How being determined by the position of the telephone switch-hook at the called substation, an automatic time-limit apparatus to cut off said ringing device in case the called party does not res ond within a given time, and an answer-bac t mechanism adapted to be connected with said cordcircuit by said time device to notify the calling subscriber of the failure of the called party to respond, substantially as described.

46. In a telephone system, the combination with av cord-circuit and a trunk-circuit adapted to connect subscribers lines for conversation, of an automatic ringing outfit associated with the cord-circuit and operative when a connection is made with the line to send ringing-current through the trunk to the called -subscribers stations, and means for aut-gmatically cutting ofi" said outiit, substantially as described.

In testimony whereof I sign this specificatien in the preseiceof two Witnesses.

'l JOHN G. noBERTs.

Witnesses:

NETTIE V. BELLES,

ELLIOTT J. SToDDARD...

roo

IIC 

